[DRBD-user] Migration path 0.7 -> drbd 8

Diego Julian Remolina diego.remolina at ibb.gatech.edu
Fri Jun 2 13:16:08 CEST 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.



Vampire D wrote:
> When is .8 due to be stable?

This has been a tricky question for a long time on the list. I am almost sure Lars's answer is going 
to be:  "WHEN IT IS READY" LOL :P

Diego

> 
> On 6/1/06, *Lars Ellenberg* <Lars.Ellenberg at linbit.com 
> <mailto:Lars.Ellenberg at linbit.com>> wrote:
> 
>     / 2006-06-01 16:14:49 +0100
>     \ paddy:
>      > is there any hard and fast rule about the on-disk structures ?
>      > what is the migration path to 0.8 like ?
> 
>     we drop the "0.", because the 0.7 (maybe already the 0.6.something)
>     should have been a "1.x" ...
> 
>     migration drbd 0.7 to drbd 8 would be something like:
>     * take down both nodes
>       (unless we incorporate some network protocol compatibility layer,
>       which is possible, but not very likely because it is much work and we
>       personally don't get much benefit from it)
> 
>     * install the drbd8 module and user space tools
>     * adjust the config (syntax has changed, some other options etc)
>       you can obviously prepare this beforehand...
>     * use drbdmeta (a new user space tool) to convert the existing
>       v07 meta data into a v8 one
>       (details how to do that follow on some wiki page)
>       but it already has a manpage.
>       you'd do something like
>          drbdmeta /dev/drbd0 v8 /dev/mapper/storage-drbd0_md 0 create-md
>       and, according to the manpage:
>        create-md
>            Create-md initializes the meta data storage.  This needs to be
>            done before a DRBD resource can be taken online for the first
>            time.  In  case there  is already a meta data signature of an
>            older format in place, drbdmeta will ask you if it should
>            convert the older format to the selected format.
>       I think the drbdadm would even do this for you (at least it probably
>       should... I'll verify that, and implement it if not already done).
>       then this would be "drbdadm convert-md-to-v8 all",
>       or something like that.
>     * start drbd 8
> 
>     not too complicated, right?
> 
>     if you practice on a test system,
>     you can probably do this with a very
>     short downtime on a productive system.
> 
>     --
>     : Lars Ellenberg                                  Tel +43-1-8178292-0  :
>     : LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
>     : Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :
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> 
> 
> 
> -- 
> "Do the actors on Unsolved Mysteries ever get arrested because they look 
> just like the criminal they are playing?"
> 
> Christopher
> 
> 
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